JPH06134207A - Oil-water separation device - Google Patents

Abstract

PURPOSE:To separate waste water efficiently into a fatty oil component and water by providing a fat and oil returning pipe for returning the fat and oil component separated and floated to the side of a separation inner tank in a precipitation separation tank. CONSTITUTION:A separation tank (2) of double structure body locating a separation inner tank (6) with a lower side opening (5) is disposed inside a separation outer tank (4) with a bottom (3) formed into the tank shape and waste water (A) mixed with animal or vegetable oil is fed to the side side of the separation inner tank 6 of the separation tank (2), and separated into the fat and oil component, primary intermediate water (D) and slurry. A mixing device (19) for injecting a neutralizing agent (E) such as caustic side into the primary intermediate water (D) fed out from the side of the separation outer tank (4) and mixing therein is provided, and also a precipitation separation tank (30) for separating flocculating intermediate water (A-1) mixed with the neutralizing agent (E) into the fat and oil component and pure water is disposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil / water separation device for separating waste water discharged from a restaurant or the like into oil components and water.

[0002]

2. Description of the Related Art Conventionally, animal and vegetable oils have been mixed in the waste water discharged from restaurants and the like, and the waste water is used to separate oil components and water in a separation tank having a settling tank.

Further, the waste water is treated by mixing a neutralizing agent in a state of being stored in a settling tank.

[0004]

However, in the above-mentioned conventional example, the entire apparatus is intermittently operated because it is necessary to wait for the impurities to settle in the settling tank. Therefore, the separation of wastewater was low in quantity and quality, and the work could not be performed efficiently.

[0005]

According to the present invention, there is provided a separation tank having a double structure in which a separation inner tank having a bottom portion and formed in a tank shape and having a lower opening is located inside the separation outer tank. The waste water mixed with animal and vegetable oils is supplied to the separation inner tank side of the separation tank so that it can be separated into oil and fat components and primary intermediate water and sludge, and the primary intermediate taken out from the separation outer tank side. A mixing device for injecting and mixing a neutralizing agent such as caustic soda into water is provided, and a precipitation separating tank for separating the coagulated intermediate water mixed with the neutralizing agent into oil and fat components and purified water is also provided. The present invention provides an oil / water separation device characterized in that it is equipped with an oil / fat return pipe for returning the oil / fat components that have been separated and floated to the separation inner tank side.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. 1 is an oil / water separation device for separating waste water A discharged from a restaurant or the like into purified water B and impurities C such as fat and oil components and sludge. is there.

Reference numeral 2 denotes a separation tank. In the separation tank 2, a separation inner tank 6 having a lower opening 5 is located inside a separation outer tank 4 having a bottom 3 and formed in a tank shape. Has a double structure. Then, in the upper part of the separation tank 2, a separation inner tank 6
An inflow pipe 7 for introducing the wastewater A is provided in the inner chamber 6-1 of the.

Further, at the base end of the inflow pipe 7, there is provided pump means 8 for introducing the wastewater A into the wastewater inlet. Reference numeral 9 denotes a heater installed at an intermediate position inside the separation inner tank 6, and 10 denotes an outer chamber formed between the separation outer tank 4 and the separation inner tank 6 of the separation tank 2 having a double structure. The primary intermediate water D separated by the separation inner tank 6 is stored.

Reference numeral 11 denotes a sludge discharge pipe provided at the bottom of the separation outer tank 4, 12 denotes an oil / fat take-out tube projecting horizontally from an upper position of the separation inner tank 6 to the outside, and 13 denotes a tip of the oil / fat take-out tube 12. Is a filtration tank having a fine screen 14, and 15 is an oil and fat storage tank connected to the filtration tank 13, and is provided with a heater 16 and a sludge drain pipe 17.

18 is the primary intermediate water D from the outer chamber 10 of the separation outer tank 4.
It is an outlet for taking out and is connected to a mixing device 19 for mixing a neutralizing agent and the like.

Reference numeral 20 denotes a neutralizer tank containing a neutralizer E such as caustic soda, and the neutralizer E is sent to the mixing device 19 side by a pipe 21 and a metering pump 22. Reference numeral 23 is a stirrer, and 24 is a flocculant tank containing a flocculant F such as a pack. The flocculant F is sent to the mixing device 19 side by a pipe 25 and a metering pump 26.

Reference numeral 27 denotes a coagulation auxiliary agent tank containing a coagulation auxiliary agent G, and the coagulation auxiliary agent G is sent to the mixing device 19 side by a pipe 28 and a metering pump 29 in the same manner as described above.

Reference numeral 30 is a precipitation separation tank, and the precipitation separation tank 30
Has a double structure in which the precipitation separation inner tank 32 is located inside the precipitation separation outer tank 31. 19A is a supply pipe for guiding the coagulated intermediate water A-1 discharged from the mixing device 19 into the precipitation separation tank 30,
33 is the lower opening of the precipitation separation inner tank 32, and 34 is the precipitation separation outer tank 31.
The secondary intermediate water H, which is an outer chamber formed between the inner tank 32 and the precipitation separation inner tank 32 and separated by the precipitation separation inner tank 32, is stored. Reference numeral 35 is a sludge discharge pipe provided at the bottom of the precipitation separation outer tank 31, 36 is an oil return pipe connecting the upper position 37 on the inner side of the precipitation separation inner tank 32 and the inside of the separation inner tank 6. By the oil / fat return pipe 36, the oil / fat components accumulated in the precipitation separation inner tank 32 can be discharged toward the separation inner tank 6.

Reference numeral 38 is a take-out pipe for taking out the secondary intermediate water H from the outer chamber 34 of the precipitation separation tank 30 to the outside, and the rear end of the take-out pipe 38 is connected to the sewer. Reference numeral 39 is a heater installed at an intermediate position inside the precipitation separation tank 32.

The embodiment of the present invention is configured as described above, and the waste water A discharged from the restaurant or the like is supplied to the separation inner tank 6 in the separation tank 2 by the pump means 8.

The wastewater A stored in the separation inner tank 6
Is heated by the heater 9, and sludge is deposited on the bottom and discharged from the sludge discharge pipe 11 to the outside.

Further, the oil and fat component in the wastewater A is floated to the upper part, filtered by the oil and fat take-out pipe 12 by the fine mesh screen 14 of the filter tank 13 and sent to the oil and fat storage tank 15.

The primary intermediate water D separated in the separation tank 2 passes through the lower opening 5 of the separation inner tank 6 and the separation outer tank 4
It is stored in the outside room 10 of.

The above primary intermediate water D is discharged to the admixing device 19 side through the outlet 18, and in the admixing device 19, the neutralizing agent E is discharged.
Aggregating primary intermediate water by mixing the flocculating agent F and the flocculating aid G
A-1 is sent into the precipitation separation tank 30 via the supply pipe 19A.

Next, the coagulated primary intermediate water A-1 supplied to the sedimentation separation inner tank 32 of the sedimentation separation tank 30 is precipitated and separated in the sedimentation separation inner tank 32, and the oil and fat components, sludge and secondary intermediate water are separated. It is separated into H and.

Then, the secondary intermediate water H stored in the outer chamber 34 of the precipitation separation tank 30 is discharged as purified water via the pipe 38.

In addition, the oil and fat component and the floating residue 44 which are floated up and stored in the precipitation and separation inner tank 32 in the precipitation and separation tank 30 are stored in the oil and fat return pipe 36.
It is returned to the separation inner tank 6 via.

As described above, in the above embodiment, the separation inner tank 6 having the bottom portion 3 and formed in the shape of a tank and having the lower opening 5 is positioned inside the separation outer tank 4 to form a double structure. The separation tank 2 is provided, and the waste water A mixed with the animal and vegetable oil is supplied to the separation inner tank 6 so that the oil and fat components and the primary intermediate water D can be separated, and the separation water is taken out from the separation outer tank 4 side. A mixing device 19 for injecting and mixing the neutralizing agent E such as caustic soda into the primary intermediate water D is provided, and a precipitation separating tank 30 for precipitating / floatingly separating the condensed intermediate water A-1 mixed with the neutralizing agent is provided. Therefore, the wastewater discharged from the restaurant, etc. is reliably separated from the free-flowing animal and vegetable oils and leftover food contained in the wastewater by the double-structured separation tank 2 and the primary intermediate water is taken out, In addition, the same intermediate water is injected into the mixing device 19 such as a neutralizing agent. Thus, the separation in the precipitation separation tank can be performed quickly and reliably.

Then, the fats and oils component can be extracted from the wastewater to easily produce the fatty acid as the raw material for the fatty acid industry.

Further, it is possible to continuously treat wastewater,
Moreover, the quality of the treated water is stable and the treatment cost can be reduced.

In addition, the oil-water separation device can automatically treat wastewater, and thus requires less labor and is safe.

[0027]

According to the present invention, a separation tank having a double structure is provided by arranging a separation inner tank having a bottom opening and having a lower opening inside the separation outer tank. By supplying waste water mixed with animal and vegetable oil to the separation inner tank side of the separation tank, it is possible to separate into oil and fat components and primary intermediate water, and caustic soda is added to the primary intermediate water taken out from the separation outer tank side. Since a mixing device for injecting and mixing the neutralizing agent is installed, and a sedimentation separation tank for separating the coagulated intermediate water mixed with the neutralizing agent is installed, the wastewater discharged from the restaurant, etc. The animal and vegetable oils and leftover food contained in the water are reliably separated by the double-structured separation tank, and the primary intermediate water is taken out. In-house separation is fast and reliable Than it is.

The fatty acid industrial raw material can be easily produced by removing the fats and oils component from the wastewater.

Further, it is possible to continuously treat wastewater,
In addition, the quality of treated water is stable and improved, and the treatment cost can be reduced.

Moreover, since the oil separation device can automatically treat wastewater, it requires less labor and is safe.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an oil / water separator according to the present invention.

[Explanation of symbols]

 A Wastewater A-1 Agglomerated intermediate water D Primary intermediate water E Neutralizer 1 Oil / water separator 2 Separation tank 3 Bottom 4 Separation outer tank 6 Separation inner tank 30 Precipitation separation tank 36 Oil return pipe

Claims (1)

[Claims] 1. A separation inner tank having a bottom (3) and formed in a tank shape, and having a lower opening (5) inside the separation outer tank (4).
A separation tank (2) with a double structure by locating (6) is provided,
Waste water (A) mixed with animal and vegetable oils is supplied to the separation inner tank (6) side of the separation tank (2) to enable separation into oil and fat components, primary intermediate water (D) and sludge, and A mixing device (19) for injecting and mixing the neutralizing agent (E) such as caustic soda into the primary intermediate water (D) taken out from the separation outer tank (4) side is provided, and the neutralizing agent (E)
A precipitation separation tank (30) for separating the coagulated intermediate water (A-1) mixed with water into oil and fat components and purified water is provided.
The oil / water separator according to (0) is equipped with an oil / fat return pipe (36) for returning the separated and floated oil / fat component to the separation inner tank (6) side.